John Mayer will not be entertaining fans tonight, as the singer was scheduled to perform a Dead & Company concert in New Orleans. Mayer can, however, give a doctor's note to any frustrated would-be concert goers—he underwent an emergency appendectomy to remove his appendix on Tuesday morning.

The Grateful Dead-adjacent band released a statement on Mayer's medical situation and subsequent cancellation, according to People, writing, "Early this morning, John Mayer was admitted to the hospital for [an] emergency appendectomy forcing the Dead & Company December 5 concert in New Orleans to be postponed. All tickets for the December 5 show will be honored for the rescheduled date. Information on the rescheduled date will be announced as soon as possible. Should ticketholders choose to seek a refund, they will be available at point of purchase.”

An appendectomy is usually necessary when you have appendicitis.

Appendicitis is essentially an inflammation in your appendix, a small organ that's attached to the first part of your large intestine. Although you may never know exactly what caused your appendicitis, the current theory is that most cases are caused by some sort of blockage within the organ or the intestinal tissue, which leads to a buildup of bacteria, infection, and inflammation.

The major symptom of appendicitis is pain found on the right side of your body. It may start near the belly button and gradually intensify and settle on the right side. You may also have a low-grade fever, nausea, or a loss of appetite. If you are suffering from symptoms, it's important to see a doctor ASAP because the appendix may rupture, leaking the infection into your abdominal cavity, which causes severe pain and is a more serious condition.

Treatment for appendicitis usually depends on how serious your condition is, but always involves some combination of antibiotics and surgery. If you catch it before it's ruptured, doctors can often remove the appendix with minimally invasive surgery. However, if it has actually ruptured and spread the infection, that's absolutely an emergency situation and may require more intense surgery because your surgeon will have to go through the thick abdominal muscle wall to get in there. You may also need to have the area drained first, which adds an extra layer of complication.

Appendicitis pain is usually tough to ignore. But if you have any concerns, check in with your doctor—ideally before you need to reschedule a bunch of tour dates. As Sanford Vieder, D.O., medical director of Lakes Urgent Care in Michigan, told SELF previously, "When we see people who have ruptured, it's generally because they waited and thought they would be fine. But appendicitis doesn't get better.”